Fuel Pump

[Boyd Birchler]

I have seen lots of fuel pumps with 2000 or more hours on them.
I have no fear of a fuel pump with 1000 hours or more than 20 years old.

[Dayton Murdock]

Originally Posted by Boyd Birchler

I have seen lots of fuel pumps with 2000 or more hours on them. I have no fe
ar of a fuel pump with 1000 hours and 20 years old.

Well there is fear at 10.5K with zero fuel pressure

But its all good, I went home and the new pump is on its way

[Boyd Birchler]

You do not say why you believe the low pressure was caused by the mechanical pump being defective. It could be caused by other phenomena, like ice or fod in the fuel system between the boost pump and the mechanical pump. In the case of ice the problem would disappear when warmed.

[Dayton Murdock]

Originally Posted by Boyd Birchler

You do not say why you believe the low pressure was caused by the mechanical pump being defective. It could be caused by other phenomena, like ice or fod in the fuel system between the boost pump and the mechanical pump. In the case of ice the problem would disappear when warmed.

I don't think ice was a factor the OAT was 41 deg and the fuel lines are in the exit air stream. 10 years of operation makes me think it time for the pump to be changed least-way I hope this will solve the issue

[Bevan]

Good call Dayton,

Assuming the pump failed due to a diaphragm failure, I assume some fuel could come out of the pump's vent port due to pressure from the boost pump. Do you recall seeing any evidence of fuel coming out the port?

Bevan

[cajunwings]

Originally Posted by Boyd Birchler

I have seen lots of fuel pumps with 2000 or more hours on them.
I have no fear of a fuel pump with 1000 hours or more than 20 years old.

Certainly they can last that long and longer. I've also seen a higher incidence of problems after the 10 year point because the rubber doesn't last forever. They seem to be more sensitive to years than engine hours. My only point was if a guy chose to be proactive 10 years was a reasonable target to think about replacing the pump.


Don Broussard

RV9 Rebuild in Progress
57 Pacer

[Ironflight]

We should to an autopsy on the bad pump (unless , of course, you have a core charge and have to return it).

[Bob Martin]

Dayton,
Wondering here if the new pump fixed the problem?
Any more info on why or how yours failed?

Going to be proactive here and replace my 20yr old 1100 hr. pump.
I did appreciate others opinions on the topic....thanks.
Spec's say 4-6 psi...I had one hour local fight yesterday where it ran under 4psi the whole time....so thinking it is tired. I do so many other things pro-actively I feel remiss just waiting for a failure such as Dayton's to happen. Plus the thought of it happening at the start of a weekend trip or worse yet in the middle of a trip....

Which one to buy?
ACS:
Tempest OH 260.
Tempest new 299.
Lycoming new 369.
Opinions?
Thanks